Patents by Inventor Randall P. Downing

Randall P. Downing has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Mineral composition
    Patent number: 8771826
    Abstract: A roofing shingle that contains a roofing granules. The roofing granules contain at least about 95 weight percent of calcium carbonate with a hardgrove grindability index of less than about 70, and from about 0.1 to about 1.0 weight percent of a pigmented material; the pigmented material contains from about 10 to about 35 weight percent of pigment and from about 90 to about 65 weight percent of a resin; and the roofing granules are coated with an amine antistrip agent.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: July 8, 2014
    Assignee: L Hoist North America, Inc.
    Inventors: Robert H. Whitaker, Richard Brann, Randall P. Downing
  • Novel mineral composition
    Publication number: 20100203290
    Abstract: A roofing shingle that contains a roofing granules. The roofing granules contain at least about 95 weight percent of calcium carbonate with a hardgrove grindability index of less than about 70, and from about 0.1 to about 1.0 weight percent of a pigmented material; the pigmented material contains from about 10 to about 35 weight percent of pigment and from about 90 to about 65 weight percent of a resin; and the roofing granules are coated with an amine antistrip agent.
    Type: Application
    Filed: January 22, 2010
    Publication date: August 12, 2010
    Inventors: Robert H. Whitaker, Richard Brann, Randall P. Downing